Tool



W. W. FORBlS.

TOOL.

APPLICATION FILED Aue.4.192o.

1,41 3, 1 10. Patented pr- 18, 1922.

: UNITE TET- OFFIQE.

wInLI-AM w. ro'n'BIs, or sen rn'anorsco, CALIFORNIA.

TOOL.

l Specificationof Letters Patent. Patentgd Apr, '18, 1922.,

Application filed-August 4, 1920. Serial no. 401,239.

tween the respective gripping parts witl1 in a predetermined limit and having an automatic or self-adjusting action or; the gripping. jaws, that. will exert a grip or squeeze on an object proportional with the leverage force exerted on the handle, as con-. trasted with the manually adjusted pipe and monkey wrenches; and to provide a device of this character that is simple and eflicient in its construction "and operation and economical to manufacture. Otherobjects and advantages will appear as this disscription progresses- In this specification and the annexed drawings, the invention is illustrated in the form consideredto be the best, but it is to be understood that the invention is not limited to such form, because it may be embiodied in other forms, and it is also to be understood that in and by the claims, follow ng the description it is desired to coverthe invention in whatsoever form it may be em bodied.

In the accompanying one-sheetof' drawings, Figure 1 is a front end elevation of a tool constructed in accordance with my invention.

Figure 2 is a side elevation of the same.

Figure 3 is a rear end elevation of Figure 2.

Figure at is a side elevation of my improved wrench, partly in section and opened to illustrate it in operative position.

Figure 5 is a plan section taken on line 55 of Figure 2.

In detail the construction illustrated in the drawings includes a handle 1 of any length. shape or weight desired, having an.

end 2 thereof surfaced to form parallel side walls. The end 2 of the handle terminates in a rounded end as at 3 and is provided with a hole drilled axially therethrough.

The gripping jaw 4 comprises a' channel or substantially U-shaped memberof which the base portion, 5 is serrated, to facilitate its cllnging or holdlng to any object. The side walls 6 and? of this jaw are adapted to straddle theparallel side walls of the handle 2 and pivotally engage the pin 8, passing through the side flanges of the jaw 41: and the handle end 3. The free end of the gripping jaw 4 is provided with an opening 9 through the base portion 5 thereof and has the abut-' ment 10 enclosing the end of the channel.

An opposed gripping jaw 11 is mounted in juxtaposition with the gripping jaw 4 and has part of its lower face serrated-as at 12.

The underside of the jaw ll is' provided with a-d'epending extension 14, that is adapted to register with'the opening 9 in the lower jaw 4, and is of less thickness than the jaw 11 and has the end 15 thereof further reduced leaving a shoulder 16 on each side I thereof, equal in height to the thickness of the links 17. The links 17 are pivotally coning the outer surfaces thereof flush with the have the opposite ends. thereof pivotally mounted on the handle 1 at 19.

This device operates as follows:

The handle 1, as. illustrated in Figure 2,-

isgrasped by the hand of anoperator and by a slight swinging action thereof, the opposed jaws 4.- and 11 are designated, moving into an opened position such as illustrated by Figure 1. If no care is taken in regulating the amount of opening of the gripping jaws, the same will ordinarily open to their widest capacity. Regulation of the width of opening of the gripping jaws is obtained by moving the pivoted lower clutch jaw either upwardly or downwardly relative to the handle 1. This movement of the lower jaw acts to adjust the relative positions of the opposed gripping jaws by reason of the extension 14 and links 15 being slidably guided within the opening 9 of the lower gripping jaw. Thus a movement of either gripping jaw will move the opposed jaw proportionately. It will be noted that the links 17 are connected to the extension 14 substantially intermediate the ends thereof permitting the rounded terminus of the reduced end 15 to bear against the inside of the The links 17 side surfaces of the extension 1 1 and free to. slide through the aforementioned opening 9 .in the lower grippingjaw.

handle 1 as at 20, preventing the lower jaw from locking the extension l t in the wide open posltion The serrated faces'5 and 12 of the respective gripping jaws are so positioned, that any movement of the lower j aw I} and corresponding movement of the upper jaw 11, through its articulated connection with the handle 1, that the jawsin opening will be maintained substantially in parallel relation, thus permitting the tool to be used on objects of any shape without further means of adjustment.

Having thus described my invention, what I claim and desire to secure by Letters Patent is-- 1 A tool such as described comprising a handle; .a jaw, having an extension thereon, and a link pivotally connected to said handle and to'said jaw extension intermediate the ends thereof; and an opposed jaw pivoted to said handle having an opening through 'the'free end thereof slidably guiding said WILLIAM W; 'FORBIS;

In presence of LINCOLN V.'JOHNSON. 

